#include <iostream>
using namespace std;
int fibo(int n)
{
    if (0 == n || 1 == n)
    {
        return 1;
    }
    return fibo(n - 1) + fibo(n - 2);
}
int main()
{
    int N;
    cin >> N;
    cout << "fibo(n)=" << fibo(N) << endl;
    return 0;
}